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-start cartilage growth. >> it really helps the cartilage, the new cartilage grow by providing an environment where the cartilage feels comfortable and feels like they can produce actual cartilage instead of scar tissue. >> dr. larry gold studied a small group of patients with damaged cartilage. most of them tried the new hydro gel. patients still had to undergo an outpatient procedure allowing tiny holes to be drilled in their bone beneath the cartilage. the hydro gel was applied. as a result healthy cartilage grows instead of scar cartilage. >> you have a repair that is more like the native cartilage. it will last longer. it will perfeorm better, the patient will be able to tolerate more weight bearing activity without pain. >> reporter: because the cartilage can last five years instead of one or two with the current approach, the new procedure may spare patients from undergoing a second cartilage repair or knee replacement surgery. larger studies are now need ed o determine if hydro gel is safe long term and if it is, it could be available to patients in just a few years. the fda must also appro
safety environment. >> reporter: diana jaeger says check-ins are important but she thinks there are better ways to address school safety. >> i would rather see the focus on the anti-bullying and the inclusion and the kindness efforts and the building community interest the inside of the school. >> reporter: from lockdown drills to improving listening skills to learning new crisis strategy. the hope is new layer of protection for our chirp. children. another thing is how to improve communication during a shooting. often schools have code words but police say it's best to be clear and simple and to announce on the pa system there's a gunman on campus. >>> new information on a story we brought you first last night. within the last two hours police released a sketch of the man they say tried to rip a 2-year-old girl out of her mother's arms. kris sanchez joins us from the san jose police department with more on that. kris? >> reporter: hi there, diane. you don't have to be a parent to know the horror this family went through. the mother just spent the last couple of hours here
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